Note:Vitamin C, (ascorbic acid) The liver of cats and dogs have the key enzyme L-gulono-Y-lactone oxidase, (EC 1.1. 3.8), which is able to synthesize the needed ascorbic acid from glucose. The NRC warns against high intake of ascorbic acid, stating the following: "High intake of ascorbic acid may act as a prooxidant and induce lipid peroxidation." This includes Fenton's reaction, which will enhanceiron absorption and cause a resulting overdose of this mineral. This reaction is reduced with an increase in Vitamin E levels in the diet. (page 234).

A bit late to the party, but this page still came up pretty high on Google. So: The amounts for things like Vitamin A and E seem confusing. Unless I'm being dense/missing something, it's recommending 80,000 IU of Vit. A for a 40 kg dog (WAY higher than a human dose)??

It says amounts are per kg of body weight except where indicated, and on the vitamin section such an exception doesn't appear to be indicated. Perhaps it should've been? Or at least some additional explanation/references to the IU conversions for each vitamin (which apparently can vary).

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